I remember trying to find something like this when I started playing this game only last February. But I just couldn’t find a list of the official maps in order. So I thought I’d just post it myself, in the hope that it can be useful for new players 
The order of the maps in each campaign is fixed, but there is no standard order in which the campaigns are played. They are listed alphabetically here, and many of the servers use the this order.
Africa
[ol]
[li]Refinery
[/li][li]Slipgate
[/li][li]Island
[/li][/ol]
North America
[ol]
[li]Valley
[/li][li]Outskirts
[/li][li]Area 22
[/li][/ol]
Nortern Europe
[ol]
[li]Quarry
[/li][li]The Ark
[/li][li]Salvage
[/li][/ol]
Pacific
[ol]
[li]Canyon
[/li][li]Sewer
[/li][li]Volcano
[/li][/ol]